function [x,y,s] = mask(a,idx,orient,vals)

[xo,yo] = fm_draw('O','Oxl',orient);

x = cell(5,1);
y = cell(5,1);
s = cell(5,1);

x{1} = [-1.8 4.1 4.1 -1.8 -1.8];
y{1} = [-1.5 -1.5 1.5 1.5 -1.5];
s{1} = 'k';

x{2} = 1.8+[-1.3 0];
y{2} = [1 -1];
s{2} = 'r';

x{3} = 1.8+[-1.3 0];
y{3} = [-1 1];
s{3} = 'r';

x{4} = 1.5*xo-1.2;
y{4} = 2*yo;
s{4} = 'r';

x{5} = [2.3 2.3 3.6];
y{5} = [1 -1 -1];
s{5} = 'r';
